Microsoft is launching a marketplace for XBOX allowing users to browse and purchase themes, games, gamer pictures, and demos from their browser. Think of it to be an App Store for games. As soon as the users turn on their system the purchased items starts downloading. The users could also view their past purchase history, and re-download older content in case you lost some of it. Although their is no bulk queue management, as you can only download one item at a time, but expect them to add this soon
